wallpaper async loading

Modules/NotificationCenter.qml

@@ -152,7 +152,7 @@ PanelWindow {
                             anchors.fill: parent
                             hoverEnabled: true
                             onClicked: {
-                                for ( const n of NotifServer.notClosed )
+                                for ( const n of NotifServer.list )
                                     n.close();
                             }
                         }

Wallpaper.qml

@@ -26,6 +26,9 @@ Scope {
                 source: WallpaperPath.currentWallpaperPath
                 fillMode: Image.PreserveAspectCrop
 
+                asynchronous: true
+                retainWhileLoading: true
+
                 // Behavior on source {
                 //     Anim {
                 //         properties: "opacity"